Tan bueen martin



2 sheets-sheet 1 (No Moelf) i VAN BUREN MARTIN &`G.'W. MET-CALPE.

L SAW MILL HEAD BLOCK.

Patented Mar. 25,. 1884.

(No Model.) A 2 sheets-'sheet 2. VVAN VBUREN MARTIN 8v C. W. METOALFE.

SAW MILL' HEAD BLOGK. No. 295,572. Patented Mar. 25,1884.

' referenceletters,

UNITED STATES Armar Finca.

VAN UREN MARTIN AND CHARLES W. METOALFE, OF HOPKINSVILLE, KY.;

' SAID MARTIN ASSIGNOR TO W. VJ. GRAIIAM, OF SAME PLACE.

SAW-MILL l-LEAD-BLOGK.A

SPECIFICATION formingpart of Letters Patent No. 295,572, dated March 25, 1884.

Application liled January 24, 1884. (No model.) i

.T0 LZZ whom, t may concern,.-

Be it known that we, VAN BUREN MARTIN and CHARLns W. METOALFE, citizens of the United States, residing at Hopkinsville, in the county of Christian and State of Kentucky, have invented a new and useful Improvement in Saw-Mills, of which the following is a speciiication, referencefbeing had to the accompanying drawings.

Figure l is a plan View cfa saw-mill carriage and track embodying our improvements. Fig. 2 is a partial verti cal sectional view. Fig. 3 is also a vertical sectional view. Fig. 4 is a perspective detail view of one of the headblocks, its rack and guide, and Fig. 5 is a perspective detail view of the graduated rule and the adjustable knee-set.

This invention has relation to saw-mill carriages; and it consists in the construction and novel arrangement of parts, as will be hereinafter fully described, and particularly pointed out in the claims appended.

Referring to the accompanying drawings by a designates the carriage track, the cross-rails band b of which are provided, near the track-sill c, with guide-blocks cZ d', in which a rack-bar, e, works longitudi-r nally of the'track; The under face of the rackbar e is provided with a short rack e, which,

engages a pinion, e2, on a shaft, e3, having bearings on the under face of the track-sill o. The outer end of the shaft c3 is made rectangular, and on itis slipped the sleeve (Z3 of the handlever d2, which is employed to set the headblocks forward when the log has been moved over the lever d.

The saw-mill carriage f is mounted on wheels f', and is operated forward andback on its track in any of the well-known ways. A longitudinal shaft, f2, provided with a nliter gear, f3, works in bearings f4 f5, projecting from the side rail, f6, of the carriage-frame- The head-block guides g g are secured to the top of the carriage-framef, near its ends, and project at each side, as shown, and their base portions at one end form the upper halves of the bearings g g3. The shaft f2 is provided near each end with a pinion, n n, which works in the head-block guides g g', and engages the rack-arms z v3 of the head-blocks gg. A crossnear the triple pawl m,

shaft, k, having bearings inboXes on the side rails of the carriage-frame, is provided with a ruiter-gear, Z, at one end, which engages the miter-gear f3, and operates to set the headblocks in their starting positions. An arm, Z, prevents the miter-gears]c3 and Z from becoming disengaged. Near the front end of the cross-shaft k, and within the carriage-frame, is

side, and have a rocking motion on the shaft k whenoperated. This loop-arm Z* carries a triple pawl, m, "curved, as shown, and provided with projeeting arms a at its lower end. Theloop-arm ZL1 is provided with a downwardlyprojecting arm, n2, to which the pawl o, for operating the loop-arm Z4, triple pawl m, and ratchet-wheel Z2, is connected, to operate the headblocks forward, as hereinafter described. A detent, o', is pivoted to the carriageframe, to engage the ratchet-wheel Z2 on the side opposite the triple pawl, to prevent backward movement of the ratchet-wheel when in engagement therewith.

A double-crank shaft, p, having its crank-H arms on opposite ends of its horizontal. portion arranged at angles of about fifteen degrees on the same side of a Vertical diameter, but on opposite sidesof the axial line of a circle, has its bearingp on the side rail of the carriage-frame and has a central vertical arm, p2, connected by a loopconnec tion, p3, to the rear end of an angular rod, q,

which passes through a guide, g', its bent end passing under the hinged detent m', to raise it and throw it out of engagement with the ratchet-wheel Z2, when desired.` The doublecrank shaft is used for this purpose, and the inner end of this double crank strikes the projections on the triple pawl m at the same time and throws the triple pawl also out of engagement, allowing the ratchet-wheel to be turned backward with its cross-shaft k.

A curved set-rack, r, having teeth on the IOO outer edge, is secured to the rear face of the cross-rail r of the carriage-frame, and curves up around the shaft k near the rear face of the ratchet-wheel Z2. This curved rack. o is provided with a scale by which the set of the head-blocks is adj usted. A lever, s, having a spring-pawl, s', is secured loosely to the crossshaft k, and said spring-pawl s engages the curved set-rack r when in its normal position. The front end of the cross-shaft 7c is made rectangular in form, to receive the head of a ratchet-lever, u, which is employed to run the headblocks back to their starting positions when a new log is to be placed on the carriage.

An adjustable rule, t, graduated to inches and fractions thereof, is secured to the sawcab in plain view of the sawyer, and is provided with a sliding` knee, t, with a set-screw o r other suitable means for setting it to cut a board of the proper thickness from the log. The face of the log should be moved up against the knee-set when the first thickness is to be cut, and the knee-set then moved away from it the distance equal to the distance required for the first thickness. The set-pawl o will, when the carriage starts forward, be in the full-line position marked 4 in Fig.l 2, and as the carriage inoves forward its point will en- I gage one of the teeth 'u of the rack-bar, and will rise into the position marked 5 in dotted lines, Fig. 2, at the same time operating the ratchet-wheel Z2, and carrying the head-blocks forward against the knee set a distance equal to the distance to which the pawl o, moved by the spring-pawl lever engaging the curved rack, has been set. which is indicated on the graduated rule. As the carriage moves farther forward,the pawl o will assume the position marked 6 in Fig. 2, and will slide along the rack-bar without operating the ratchetwheel, and when it reaches the dust-pitV and slips from the rack-bar it will assume the position marked 7 in dotted lines in Fig. 2. Vhen the frame is gigged back, the pawl o will strike the end of the rack-bar, and will assume the original position marked 4, and slide back along the rack-bar without operating the ratchet-wheel.

It will thus be seen that the head-blocks will be operated forward automatically without the use of levers or screws when the log has been sawed up. The head-blocks may be run back to the starting-point by throwing the triple pawl m and the hinged detent out of gear, and lifting upon the ratchet-lever at the end of the cross-bar 7c and working it back and forth.

' By this construction we can automatically set the log the required distance by the forward movement of the carriage, thereby dispensing with one hand and avoid the annoyance and expense of mistakes. Each end of the log is set up at the same time, and no time is lost,

as each time the carriage moves forward the log is set up the required distance before reaching the saw. The device is cheap and simple in its construction, is easily operated by one man, and is not likely to get out of order.

Having thus fully described our invention, whatwe claim as new, and desire to secure by Letters Patent of the United States, is-

l. In a saw-mill carriage, the combination, with the carriage-frame provided with headblock guides, and head-block provided with rack-arms adapted to work in said guides, of ashafthavingpinions engagingthehead-block, racks geared to a cross-shaft having a ratchetwheel near one end, aloop-arm provided with a triple pawl engaging the ratchet-wheel, and a pivoted pawl adapted to engage a rack-bar on the track-frame, whereby the head-blocks may be operated automatically by the forward motion of the carriage-frame, to set the log forward any predetermined distance, substantially as specified.

2. In a saw-mill carriage, the combination, with the graduated rule provided with a kneeset adj ustably secured thereon, secured o the saw-cab, of a' carriage-frame provided with head-blocks, having rack-arms working in head-block guides, and mechanism for automatically feeding the head-blocks forward by means of a set-pawl and rack-bar, when the carriage-frame is moved forward, substantially as specied. v

3. In a saw-mill carriage, the combination of the ratchet-wheel on the cross-shaft le, pro- 'vided with gearing for operating the headblocks in their guides, with the triple pawl m, face-plates, with loop Z4, connected to the pivoted pawl o by an arm, the hinged detent, the double-crank lever, and hook-rod connected thereto, and the rack-bar for engaging the hinged pawl o, substantially as specified.

4t. In a saw-mill carriage, the combination, with the longitudinal shaft having a mitergear, and pinions engaging the rack-arms of the head-block, of the cross-shaft having a miter-gear and a ratchet-wheel and a ratchetlever at the front end of the cross-shaft 7c, the triple lever and hinged detent, and mechanism for throwing the same out of gear, whereby the head-blocks may be moved to their starting-points by operating said ratchet-lever, substantially as specified.

5. In a saw-mill carrage, the combination, with the ratchet-wheel on the cross-shaft 7c, the curved rack and lever on said shaft, provided with the spring-pawl, the triple pawl, the pawl o, and pivoted detent, of the double crank and angular rod connected to its arm, and the rack-bar working in guide-.boxes on the track-frame, substantially as specied.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures inpresence of two witnesses.

VAN BUREN MARTIN. CHARLES W. METGALFE. Witnesses:

D. J. GIsH, ED T. CAMPBELL.

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